Table 1: Constraints on the minimum grain size $a_{\rm {min}}$ in the disk based on the interpretation of the color indexes measured in the visible (HST/ACS, Clampin et al. 2003). Compact grains with a differential size distribution proportional to $a^{-\kappa }$ are assumed. Sizes are expressed in $\mu$ m. They are computed with Eqs. (A.8), (A.11) (with $\alpha =3$ ) and (A.1) assuming $\kappa =3.5$ and complex dielectric permitivities of $\epsilon=2.8+{\rm i} ~0.1$ (or $n\simeq 1.67$ ) for amorphous silicate and $\epsilon=5.1+{\rm i} ~0.6$ (or $n\simeq 2.26$ ) for graphite (Laor & Draine 1993). "B-I'' and "V-I'' refer to the bands used to measure the color effects. a₀ is computed in the I band.
lower limit upper limit

on $a_{\rm {min}}$ ( $a_{\rm {min}}^{-})$ on $a_{\rm {min}}$ (10 a₀)

B-I V-I

Silicate: 0.077 0.095 3.1

Graphite: 0.041 0.051 1.6

**Table 1:** Constraints on the minimum grain size $a_{\rm {min}}$ in the disk based on the interpretation of the color indexes measured in the visible (HST/ACS, Clampin et al. 2003). Compact grains with a differential size distribution proportional to $a^{-\kappa }$ are assumed. Sizes are expressed in $\mu$ m. They are computed with Eqs. (A.8), (A.11) (with $\alpha =3$ ) and (A.1) assuming $\kappa =3.5$ and complex dielectric permitivities of $\epsilon=2.8+{\rm i} ~0.1$ (or $n\simeq 1.67$ ) for amorphous silicate and $\epsilon=5.1+{\rm i} ~0.6$ (or $n\simeq 2.26$ ) for graphite (Laor & Draine 1993). "B-I'' and "V-I'' refer to the bands used to measure the color effects. a₀ is computed in the I band.
	lower limit		upper limit
	on $a_{\rm {min}}$ ( $a_{\rm {min}}^{-})$		on $a_{\rm {min}}$ (10 a₀)
	B-I	V-I
Silicate:	0.077	0.095		3.1
Graphite:	0.041	0.051		1.6

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